Atmel Xplained Evaluation Board AT32UC3A3-XPLD AT32UC3A3-XPLD Data Sheet
Product codes
AT32UC3A3-XPLD
Atmel AVR32918: UC3-A3 Xplained Hardware User’s Guide [APPLICATION NOTE]
32159C
−AVR−07/2012
7
Table 3-5. UC3 I/O expansion header – J4.
Pin J4
UC3 pin
Shared with onboard functionality
1
TWI1 SCL
(
)
PA14/PA15 USART1 RTS
2
TWI1 SDA
PA15/PA12 USART1 CTS
3
USART1 RXD
PA05
-
4
USART1 TXD
PA06
-
5
SPI0 CS3
PA07
-
6
SPI0 MOSI
PA10
Serial flash/DataFlash
7
SPI0 MISO
PA11
Serial flash/DataFlash
8
SPI0 SCK
PA08
Serial flash/DataFlash
9
GND
-
-
10
VCC_P3V3
-
-
Note:
1. See known issues Section
4.
Memories
The Atmel UC3-A3 Xplained has an external SDRAM memory mounted on the board. There are also footprints
available for adding either an industrial standard or a proprietary Atmel DataFlash serial flash.
available for adding either an industrial standard or a proprietary Atmel DataFlash serial flash.
Note:
The footprints share the same SPI lines including the chip select, and so it is not possible to mount a device on both
footprints at the same time.
footprints at the same time.
Table 4-1. Compatible devices for the footprints.
Atmel AT45DB
Atmel AT25DF
AT45DB64D2-CNU
AT25DF641A-SH
AT45DB321D-MWU
AT25DF321A-SH
AT45DB161D-SS
AT25DF161-SH
AT45DB081D-SS
AT25DF081-SSH
AT45DB041D-SS
AT25DF021-SSH
AT45DB021D-SS
AT45DB011D-SS
5.
Miscellaneous I/O
5.1
Mechanical button
The board is equipped with one mechanical button. Because the button is used to enter bootloader mode it has a pull-
up mounted, this means it is not necessary to use the pull-up in the UC3 to detect the status of the button.
up mounted, this means it is not necessary to use the pull-up in the UC3 to detect the status of the button.
5.2
LEDs
The Atmel UC3-A3 Xplained has four yellow LEDs which are connected to the Atmel AT32UC3A3256 and all of them
are active low.
are active low.